
function getDay(day) {
  var today = new Date();
  var targetday_milliseconds = today.getTime() + 1000 * 60 * 60 * 24 * day;
  today.setTime(targetday_milliseconds); //注意，这行是关键代码
  var tYear = today.getFullYear();
  var tMonth = today.getMonth();
  var tDate = today.getDate();
  tMonth = doHandleMonth(tMonth + 1);
  tDate = doHandleMonth(tDate);
  return tYear + '-'  + tMonth + '-' + tDate;
}

function doHandleMonth(month) {
  var m = month;

  if (month.toString().length == 1) {
    m = "0" + month;
  }
  return m;
}

export { getDay }
